package 爱丽丝的人偶;

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        StringBuilder s = new StringBuilder("");
        int m = (n + 1) / 2;
        for (int i = 0; i < m; i++) {
            s.append(i + 1 + " ");
            if (i + 1 != n - i) {
                s.append(n - i + " ");
            }
        }
        System.out.println(s.toString());
    }
}